摘要:
The holder for a head replacement-type cutting tool (1) is provided with a holder main body (2) and a tubular coupling member 3 which is housed in an attachment hole (4) formed on the holder main body (2) and made of a metal material lower in hardness than the holder main body (2). A recessed part is formed on an inner circumferential face of the attachment hole (4), the coupling member (3) is engaged with the recessed part by firmly attaching the outer circumferential face thereof on the inner circumferential face of the attachment hole (4), and the coupling member (3) is provided with an attachment screw part (3E) which is screwed into a head-side screw part (13) formed at the replacement-type cutting head (10).
摘要:
Provided is an end mill wherein: the generation of burrs can be controlled according to the various machining conditions and/or to the board thicknesses of the various work pieces to be machined; and smooth machining work can be carried out, with good chip removal performance, and with a finished surface of excellent quality. In this end mill, an end mill body 1 rotatable on an axis O has a cutting edge section 3 which provides first peripheral cutting edges 4A which are handed and helically shaped around the axis O, and second peripheral cutting edges 4B with a linear shape extending straight in parallel to the axis O. Further, the first peripheral cutting edges 4A are right-handed helical and right hand teeth formed as a helical shape handed in the end mill rotational direction T from the rear side to the top side.
摘要:
Provided is a ball end mill that does not interfere with the defect resistance of a cutting edge of which a rotational track forms a convex hemispherical shape. In the ball end mill, a gash 4 is formed at a front end portion of a main end mill body 1 rotated about an axis O and a cutting edge 5 of which a rotational track around the axis 0 forms a convex hemispherical shape having a center C on the axis O is formed at a peripheral edge portion of a wall surface 4A of the gash 4 facing an end mill rotation direction T. A difference between an included angle, which is formed between a straight line connecting a position which is present on the cutting edge 5 and at which a depth of the gash 4 is maximal in a cross-section orthogonal to the cutting edge 5 with the center C and the axis O, and an included angle, which is formed between a straight line connecting a position which is present on the cutting edge 5 and at which a rake angle of the cutting edge 5 is maximal on a positive angle side in the cross-section orthogonal to the cutting edge 5 with the center C and the axis O, is within ±7°.
摘要:
Provided is a replaceable machining head wherein: fractures on the tool attaching portion do not occur; the production cost is minimized; the tool life of the working tool will be lengthened; and the head body is free from a risk of falling off during replacement. In the replaceable machining head 1, a cutting edge section 3 is formed on the front side of a head body; a tool attaching portion 4 to which a working tool is to be attached, is formed on the rear end side of the cutting edge section 3; tool attaching faces 4A are formed in the tool attaching potion 4; the surface of the head body 1 is coated with a coating film; and the number of droplets or macro particles having convex shapes with a size of 0.3µm to 5.0µm, is 200 or less, per area of 40µm×60µm on the surface of the coating film over the tool attaching faces 4A.
摘要:
The wear of a flank face of a long bottom blade of the tip of an end mill body is effectively minimized, and chips produced by the long bottom blade are smoothly discharged. Bottom blades (9) are formed at ridgelines where gashes (7) and tip flank faces (8) intersect, the gashes (7) being formed at the tips of a plurality of chip discharge grooves (4) that are formed in an end mill body (1). At least one of the bottom blades (9) serves as a long bottom blade (9A) that extends toward an inner peripheral side longer than the remaining bottom blades (9B, 9C). Coolant holes (10) are formed between the chip discharge grooves (4) within the end mill body (1). A coolant hole (10A) that is located between a chip discharge groove (4A) of a gash (7A) along which the long bottom blade (9A) is formed and a chip discharge groove (4C) that is located behind the chip discharge groove (4A) in a rotational direction (T) of the end mill is open to the tip clearance face (8A) of the long bottom blade (9A). A coolant hole (10B) which is located between the chip discharge groove (4A) of the gash (7A), along which the long bottom blade (9A) is formed, and a chip discharge groove (4B) that is located in front of the chip discharge groove (4A) in the rotational direction (T) of the end mill is open to the gash (7A) of the long bottom blade (9A).
摘要:
A replaceable head cutting tool increases the strength of engagement between a tool body and a coupling member without causing damage to the tool body or the punch. A cylindrical mounting unit 21 of the coupling member 2, which is made of a metal material having hardness lower than the hardness of the tool body 1, is inserted into a mounting hole 16 that includes a concave portion 17 formed on the inner surface of the tool body 1 made of a hard material. The mounting unit 21 is plastically deformed so as to increase in diameter, and the outer peripheral surface of the mounting unit 21 comes into close contact with the inner peripheral surface of the mounting hole 16 and is engaged with the concave portion 17, so that the tool body 1 and the coupling member 2 are joined to each other. The concave portion 17 includes a first wall surface 17a that is inclined toward the outer peripheral side as the first wall surface moves in an insertion direction F of the mounting unit 21, and a second wall surface 17b that is opposite of the first wall surface 17a and is inclined toward the inner peripheral side as the second wall surface moves in the insertion direction F. A first inclination angle ±, which is formed between the first wall surface 17a and a plane S perpendicular to a center line of the mounting hole 16 at a position where the first wall surface 17a intersects with the inner peripheral surface of the mounting hole 16, is smaller than a second inclination angle ², which is formed between the second wall surface 17b and the plane S at a position where the second wall surface 17b intersects with the inner peripheral surface of the mounting hole 16.